avoid evaluate of compound assignment after dead_code transform (#2861)

fixes #2860
2018-02-01 16:18:29 +08:00
parent 102f994b9d
commit aa664dea0a
3 changed files with 79 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -5358,6 +5358,7 @@ merge(Compressor.prototype, {
                    if (in_try(level, parent instanceof AST_Throw)) break;
                    if (is_reachable(def.scope, [ def ])) break;
                    if (self.operator == "=") return self.right;
+                    def.fixed = false;
                    return make_node(AST_Binary, self, {
                        operator: self.operator.slice(0, -1),
                        left: self.left,